////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1993-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_dynamic_ld_h)
#define octave_dynamic_ld_h 1

#include "octave-config.h"

#include <list>
#include <string>

#include "oct-shlib.h"

class octave_function;

namespace octave
{
  class interpreter;

  class
  dynamic_loader
  {
  private:

    class
    shlibs_list
    {
    public:

      typedef std::list<dynamic_library>::iterator iterator;
      typedef std::list<dynamic_library>::const_iterator const_iterator;

      shlibs_list (void) : m_lib_list () { }

      // No copying!

      shlibs_list (const shlibs_list&) = delete;

      shlibs_list& operator = (const shlibs_list&) = delete;

      ~shlibs_list (void) = default;

      void append (const dynamic_library& shl);

      std::list<std::string> remove (dynamic_library& shl);

      dynamic_library find_file (const std::string& file_name) const;

      void display (void) const;

    private:

      // List of libraries we have loaded.
      std::list<dynamic_library> m_lib_list;
    };


  public:

    dynamic_loader (interpreter& interp)
      : m_interpreter (interp), m_loaded_shlibs (), m_doing_load (false)
    { }

    // No copying!

    dynamic_loader (const dynamic_loader&) = delete;

    dynamic_loader& operator = (const dynamic_loader&) = delete;

    virtual ~dynamic_loader (void) = default;

    octave_function *
    load_oct (const std::string& fcn_name,
              const std::string& file_name = "",
              bool relative = false);

    octave_function *
    load_mex (const std::string& fcn_name,
              const std::string& file_name = "",
              bool relative = false);

    bool remove_oct (const std::string& fcn_name,
                     dynamic_library& shl);

    bool remove_mex (const std::string& fcn_name,
                     dynamic_library& shl);

  private:

    void clear_function (const std::string& fcn_name);

    void clear (dynamic_library& oct_file);

    interpreter& m_interpreter;

    shlibs_list m_loaded_shlibs;

    bool m_doing_load;

    static std::string name_mangler (const std::string& name);

    static std::string name_uscore_mangler (const std::string& name);

    static std::string mex_mangler (const std::string& name);

    static std::string mex_uscore_mangler (const std::string& name);

    static std::string mex_f77_mangler (const std::string& name);

    static void * try_load_mex (dynamic_library& mex_file,
                                const std::string& fcn_name, bool& have_fmex);
  };
}

#endif
